linux-kernel - [linux-stable-rc:linux-4.9.y 9923/9999] drivers/scsi/libsas/sas_scsi_host.o: warning: objtool: sas_target_destroy() falls through to next function sas_slave

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Message-ID: <202107191136.StwN9DsZ-lkp@intel.com>
Date:   Mon, 19 Jul 2021 11:31:01 +0800
From:   kernel test robot <lkp@...el.com>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: [linux-stable-rc:linux-4.9.y 9923/9999]
 drivers/scsi/libsas/sas_scsi_host.o: warning: objtool: sas_target_destroy()
 falls through to next function sas_slave_configure.cold()

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.9.y
head:   e000f87958680ef8e8724d749ed5cd4c769a18cf
commit: 410b20dd6f219d4fc3ac2c48705fc0f4025e2078 [9923/9999] objtool: Support GCC 9 cold subfunction naming scheme
config: x86_64-randconfig-a001-20210718 (attached as .config)
compiler: gcc-10 (Ubuntu 10.3.0-1ubuntu1~20.04) 10.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git/commit/?id=410b20dd6f219d4fc3ac2c48705fc0f4025e2078
        git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
        git fetch --no-tags linux-stable-rc linux-4.9.y
        git checkout 410b20dd6f219d4fc3ac2c48705fc0f4025e2078
        # save the attached .config to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash LDFLAGS=-z max-page-size=0x200000 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   drivers/scsi/libsas/sas_scsi_host.c: In function 'sas_slave_configure':
   drivers/scsi/libsas/sas_scsi_host.c:863:24: warning: variable 'sas_ha' set but not used [-Wunused-but-set-variable]
     863 |  struct sas_ha_struct *sas_ha;
         |                        ^~~~~~
   arch/x86/include/asm/bitops.h: Assembler messages:
   arch/x86/include/asm/bitops.h:257: Warning: no instruction mnemonic suffix given and no register operands; using default for `btr'
   arch/x86/include/asm/bitops.h:257: Warning: no instruction mnemonic suffix given and no register operands; using default for `btr'
>> drivers/scsi/libsas/sas_scsi_host.o: warning: objtool: sas_target_destroy() falls through to next function sas_slave_configure.cold()

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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